And the video channels are small enough that they aren't being monetized its just their preferred way to share information. It is definitely how my teenage son gets lots of information. OTH, I think it is terribly inefficient.
Most of the best YT content are actually in the small unmonetized channels, precisely because they create for passion instead of using every obnoxious Youtuber superstar antic possible to game the recommendation algorithm for viewcount and ad money.
The bigger channels who are still doing quality content including one BigClive who are doing similar electronic teardowns and analysis are increasingly turning towards Patreon to fund themselves, since it's impossible to keep up with the low effort content spammers gaming the monetization system without throwing themselves into the same dumpster.
The bubble for the latter is bursting anyway since YT has been steadily cutting down on the monetization payouts, and I have no sympathy when the garbage creators all go out of business.
And yeah I also agree videos are an inefficiently way for disseminating content in some contexts. Like PC hardware benchmarking.